tusenfem
Illuminator
- Joined
- May 27, 2008
- Messages
- 3,306
Having gone through the second part of Birkeland's paper, I must conclude that there is nothing specific about the sun that is discussed in there. It is mainly showing that Störmer is wrong in his assumption that the aurora is created by positively charged corpuscules, and some more discussion about climate effects from variations of the Sun, etc. So, I guess I have to go back to Birkeland's books on the auroral expidition and look at the pages he cited above.
However, I did ponder on what Birkeland wrote and specifically his term "rayons helio-cathodiques" or translated "helio-cathode rays." I think that the main quote from his paper in this case is:
... that I had the idea that we would have to make very strong cathode rays, that I have called helio-cathode rays; I have calculated that the negative electric tension necessary for the emission of these rays is about 600 million volts.
So, the sun emits very strong cathode rays, which is early 20th century speak for electrons. However, the energy of these cathode rays should be so immense 600 million volts, that I guess Birkeland could not envision how such an energy would be possible in the laboratory or on Earth, so he decided to call them "helio-cathode rays," just a very energetic subset of cathode rays.
Hehehehehe I just found this link to Christiania videnskabs-selskab where there is an english translation of the french paper, go figure!
So, where does this bring us?
I think the following. Birkeland experimented with his terrellas, and also wanted to make a link to things he observed on the sun. Now, from what he wrote in the now-discussed paper, he does think that there are positive and negative corpuscules emitted by the Sun. However, I do think that Birkeland did not mean that the Sun is a cathode (though maybe in his book he may state otherwise I need to check that) because "cathode" is always accompanied by "ray" and as an experimental scientist working with electricity all the time, I am sure Birkeland also understood that cathodes do not emit positive corpuscules. I am, therefore, also not sure whether the New York Times reporter has written it up wrongly or that Birkeland was indeed mistaken about the depositing of platinum on objects connected to the anode.
Next step, back to pages 580-571 and 536-540 of the book and see what we learn there.
For the rest, MM can jump in anytime to give his interpretation of what I have just discussed here.
However, I did ponder on what Birkeland wrote and specifically his term "rayons helio-cathodiques" or translated "helio-cathode rays." I think that the main quote from his paper in this case is:
Birkeland said:... que j'eus l'idée que nous avions à faire à des rayons cathodiques très puissants que j'ai appelés les rayons hélio-cathodiques; j'ai calculé que la tension électrique négative nécessaire à la projection de ces rayons était de 600 millions de volts.
... that I had the idea that we would have to make very strong cathode rays, that I have called helio-cathode rays; I have calculated that the negative electric tension necessary for the emission of these rays is about 600 million volts.
So, the sun emits very strong cathode rays, which is early 20th century speak for electrons. However, the energy of these cathode rays should be so immense 600 million volts, that I guess Birkeland could not envision how such an energy would be possible in the laboratory or on Earth, so he decided to call them "helio-cathode rays," just a very energetic subset of cathode rays.
Hehehehehe I just found this link to Christiania videnskabs-selskab where there is an english translation of the french paper, go figure!
So, where does this bring us?
I think the following. Birkeland experimented with his terrellas, and also wanted to make a link to things he observed on the sun. Now, from what he wrote in the now-discussed paper, he does think that there are positive and negative corpuscules emitted by the Sun. However, I do think that Birkeland did not mean that the Sun is a cathode (though maybe in his book he may state otherwise I need to check that) because "cathode" is always accompanied by "ray" and as an experimental scientist working with electricity all the time, I am sure Birkeland also understood that cathodes do not emit positive corpuscules. I am, therefore, also not sure whether the New York Times reporter has written it up wrongly or that Birkeland was indeed mistaken about the depositing of platinum on objects connected to the anode.
Next step, back to pages 580-571 and 536-540 of the book and see what we learn there.
For the rest, MM can jump in anytime to give his interpretation of what I have just discussed here.